Which term means 'Fully sufficient, enough'?

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Understanding this item centers on finding a word that expresses sufficiency. Adequate means enough or satisfactory for a given purpose, which matches the idea of something being fully sufficient or enough. The other words don’t fit: abrupt describes something sudden or brusque; adhere means to stick to or follow; aegis refers to protection or sponsorship. So the term that best conveys "fully sufficient, enough" is adequate.